Which of the following is NOT a symptom of anesthetic toxicity?

The correct answer is an indication of a symptom that is not associated with anesthetic toxicity. Metallic taste, numbness of the tongue, and tinnitus are all recognized symptoms that can occur in cases of anesthetic toxicity.

Metallic taste may occur because certain anesthetics can affect the taste sensation, leading to unusual sensations in the mouth. Numbness of the tongue is also a common side effect, as local anesthetics can lead to tingling and numb sensations in areas where they are administered or even systemic absorption leading to neurological effects. Tinnitus, or ringing in the ears, can occur due to changes in nerve function or blood flow resulting from anesthetic exposure.

In contrast, increased appetite is not associated with anesthetic toxicity. There is no evidence or clinical observation linking increased appetite with the adverse effects of anesthetics, making it the option that doesn't fit with the others in terms of potential symptoms of toxicity.